2,4-Difluorophenylhydrazine hydrochloride → 8-Chloro-2-[2-(2,4-difluoro-phenyl)-2H-[1,2,4]triazol-3-yl]-4,5-dihydro-6-oxa-1,3a,9-triaza-benzo[e]azulene

HRID 886396Notes

Reaction equation

C[N:2](C)[CH:3]=[N:4][C:5]([C:7]1[N:16]=[C:15]2[N:9]([CH2:10][CH2:11][O:12][C:13]3[CH:20]=[C:19]([Cl:21])[N:18]=[CH:17][C:14]=32)[CH:8]=1)=O.Cl.[F:24][C:25]1[CH:30]=[C:29]([F:31])[CH:28]=[CH:27][C:26]=1[NH:32]N>C(O)(=O)C>[Cl:21][C:19]1[N:18]=[CH:17][C:14]2[C:15]3[N:9]([CH2:10][CH2:11][O:12][C:13]=2[CH:20]=1)[CH:8]=[C:7]([C:5]1[N:32]([C:26]2[CH:27]=[CH:28][C:29]([F:31])=[CH:30][C:25]=2[F:24])[N:2]=[CH:3][N:4]=1)[N:16]=3

Participants

Conditions

Temperature: 95 °C

Procedure

8-Chloro-4,5-dihydro-6-oxa-1,3a,9-triaza-benzo[e]azulene-2-carboxylic acid 1-dimethylamino-methylideneamide (0.00907 mol) was dissolved in Acetic acid (36 mL). 2,4-Difluorophenylhydrazine hydrochloride (1.965 g, 0.01088 mol) was added and the reaction was stirred at 95° C. for 2.5 hours. The AcOH was removed in vacuo. The crude was triturated in iPrOH to afford 2.828 g (78% yield over 2 steps) of 8-Chloro-2-[2-(2,4-difluoro-phenyl)-2H-[1,2,4]triazol-3-yl]-4,5-dihydro-6-oxa-1,3a,9-triaza-benzo[e]azulene as a light brown powder clean by 1H NMR. MS (ESI+) 401.1

Workup

customThe AcOH was removed in vacuo
customThe crude was triturated in iPrOH

Sources & evidence

ORD record: ord-6a5d297fcdf04b94af90fc6666adb7a7
Source dataset: uspto-grants-2012_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08242104B2

Reaction notes

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